If you're ever wondering why various attempts to ban end to end encryption are a bad Idea and why we are against warrantless dragnets of people's electronic communications here are two of the reasons.
https://www.eff.org/deeplinks/2024/06/hack-age-verification-company-shows-privacy-danger-social-media-laws
https://www.abc.net.au/news/2021-06-02/police-gave-domestic-violence-victim-data-to-attacker/100173270
Criminals will still find a way to hide their communications. You're literally wanting to spy on law abiding people.
This will not protect the children in any way.
Ask yourself would you like a fascist to have access to your pressure points?